Filtering-leaf.



G. W. SHEPHERD.

FILTERING LEAP.

APPLICATION FILED SEPT. 3, 1913.

Patented May 12, 1914. f

UNITED STATES FFCE.

GEORGE w. SHEPHERD, or NEW YORK, N. essieu-on ro rr: normas PATENT VACUUM FILTER COMPANY INC., A CORPORATN JF E NEVADA. f l

FILTERING-LEAF.

To all whom' it may concern.:

Be it known that l, Geenen l?. Surrnran, a citizen of the United States. and a resident of the city, county', and State of Xew York, have invented new and useful improvements in Filtering-Leaves, of which the following is aspecitication.

The object of my invention is to eifectively and rapidly dislodge slime cakes which are formed ou the filter-surfaces of filter leaves during' the process of filtering' compounds, resulting' fro-1n the well known .c vanid process of treating ores. 'My invensure whatever, thus saving the filter niediuin the wear and tear incident to internal pressure, but i.. may he used with internal pressure also, if desired.

My apparat-us for cake dislodglnent has a great advantage over other siinilar apparatus in that they apply the spray or sheet of water on to the outside of the cake, while with my apparatus the water is applied beneath the surface of the cake or inside the cake. In using former apparatus the tendency of the water was to make the cake adhere more closely to the filter -leaf by reason of the external pressure and wetting of the cake caused by the spray and the cake would hang on to the filter medium until washed away or carried oli' piece-meal orV in a solution, so to speak. VWith my apparatus I force the cake awayT from the filter inediuin in bulk by pressure and do not depend upon piecemeal washing away of the cake. It is sonietimes found that when pressure is created between the cake and the filter medium they are separated a distance below the opening in the dislodging pipes before the cake is separated at its top, thus confining the pressure for a short time between the Specicaton of Letters Patent.

'preciated 4toward the Vfilter surface so that the water PatentedMay 12,-

Divided and this application filed September 3,

cake and the niediuui. This isforafshort `time only, however, so that when thetop is separated the 'cake comes Aclear of theme-1v diuni thereby cleaning the entir surface in f a very short time. Ely invention has inany advantages .hief '60 of which is the saving' in time and in, ainount of water used. .lt is to be reni'einberedfthaty water valuable in a large pla'ntfandconsiderable saving thereof is greatly to be ap-v Other advantages of in v in'ventionjiill be,v apparent after reading' the follow', if; detailed description taken inconnecyionwith the accompanying' drawings, in .iihi'ili f"" Figure l is a side elevation of a'ilterleafWO en'ibodying my invention; Figz is a. bottin. i'iew of piping used for supplying "water," to dislodge the cake; andFig'. Sisan enf" lare'ed section on line 3-3 of. 1 with va lalte thereon shown in dotted lines. 'y' ln i? l, l represents the franie, which may he of any construction,v but it preferahly consists of tubing', the bottoni nieniber f 5 of which is perforated or slotted, the` 'peri fo 1ations or slot openinginto the interior offs() the leaf. This member is connectedlin this instance through the right-handend frame?" ineniber with a vacuum punip,`fnot'shownff' through any suitable connection. as 6. f' are filter' media, one on each* de "ofZth fraaie. These are held apart' cliii'iiigr thefiltering' process by any suitable ysparing*l means such as wooden sticksiS. The filter."l inedia are stitched togethergj/asfshown. at" dotted lines 9. forthe purposeoff holding the spacing sticks in place. finitruinib'er"4 ofjl sticks may be placed between suefces'siief stitched portions. This vstitchii aj is useful in 'preventing' ballooning; internal-psure is placed on the leaf. 'Theuppenpa of the filter media 7 is securely clamped tween the headers 1G by means vofbolt l, 2 represent small pipesrunning" alonc the upper portion of the leaf. y Each of these i pipes has openings or a'slotilfO along `the. lengt-h thereof extendingsubstantially the f whole length of the leaf. These slots or rows l of openings are preferably lplaced'"onthe lower side of the pipes and slightlvdnward 105 will be applied inthe direction thereof. The outer end of the pipes is closed by an ordinary cap 13. The pipes are joined by a suitable fixture '14 which 'is arranged to be connected to the supply pipe l2. It is desirable y A valve,- such as a check-valve. l1, is placed in the pipe 1,2 through which water under pressure is admitted to the dislodging pipes l and 2. This valve is arranged to open toward the leaf and to close in the reverse direction so that there will be no movement of liquid into the pipe l2. The pipe l2 is connected with any suitable water supply under pressure. j

While the dislodging pipes l, Q are shown as being on a level with the lower side of the top frame pipe it is to be understood that my invention is not limited to this arrangement, as they maybe either above or below this Y point. These pipes may be of any desirable shape in cross-section.

It is understood, of course, that my invention may be used to dislodge cakesvunder many conditions. In fact, it can be used as a step in any of the processes of filtering new in use. Specifically it may be used to dislodge a, cake while the leaf is submerged or while the leaf is suspended in nvir. lt is also applicable whether or not internal water exists in the lea f, also with .or without internal pressure, as for instance, after decanting the Water bath. It may also be used with or Without drying the cake by continued vacuum after the cake is removed from liquid.

While I have described my invention with the use of water, I have done so for conve-nience only` as air or other fluid may be used with satisfactory results, and all vare within my invention. lVater is generally used for this purpose, however, and is preferred.

My invention is not limited to any particular kind of pipe or passage for dislodging fluid as there may be many ways of accomplishing this. In its broadest aspects my invention includes all means for admitting fluid under pressure beneath the surface of the cake formation.

The matter claimed in this application is I' divided out of my application, Serial No.

764,842, led May l, 1913, in which the claims are directed to the process.

matinee Having described my invention what I claim as new and desire to secure by'Letters Patent is 1.1i filter leaf comprising a frame, filter media carried thereby and cake-dislodging means connected with the upper portion of said leaf for directing water under pressure between the filter medium and its cake.

2. In a filter leaf, the combination of a frame, filter media carried thereby and cakedislodging means mounted on the upper portion of said leaf and adapted to direct water under pressure beneath the surface of the cake. i

3. lnafilter leaf, the combination of a frame, filter media carried thereby and a cake-dislodglng pipe mounted on said leaf and extending the length of said leaf having an opening` to admit water under pressure between said cakes and said media to dislodge the cakes.

4. A filterdeaf comprising a frame, filter media carried thereby. a cale-dislodging pipe on each sidcof the upper portion of said leaf and carried thereby and having an opening in its lower portion, said pipes being arranged to receive and discharge fluid under pressure beneath the surface of the cake.

5. A filter leaf comprising` a frame, filter media carried thereby, a cake-dislodging pipe on each side of the upper portion of said leaf and carried thereby and having an opening in its lower portion, said pipes being arranged to receive and discharge fluid under pressure along the outer surface of said media beneath the surface of the cake.

6. Avlter leaf comprising a frame, filter media carried thereby, a cake-dislodging pipe on each side of the upper portion of said leaf and carried thereby and having a slot in the lower portion thereof for discharging a continuous sheet of water under pressure beneath the surface of the cake.

7. A filter. leaf comprising a frame, filter 'media carried thereby, a cake-dislodging pipe on each side of-the upper portion of said leaf and carried thereby and having a slot in the lower portion thereof for discharging a continuous sheet of water under pressure between the cake and the filter medium.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing` witnesses.

' GEORGE lV. SHEPHERD.

Witnesses NEWTON A. BURGESS, EDWIN Suena. 

